Lets say I mass a standard 12oz bottle of beer, just the liquid not the bottle. (specific gravity of this beer= 1.0113) The scale reads 384.7g. How do I convert this to a liquid volume. I thougt I could convert the grams to ounces and then devide by specific gravity but it didn't look correct. I got 13.42 fluid oz. But I belive it to be closer to 12.2-12.4. Any help would be much appriciated.

This is true, but does not answer my question. First off is an oz(mass) equal to an oz(fluid). Second you did not take density into account which makes a significant difference. My main goal is to be able to find the actual volume of the liquid by simply massing it, and doing a conversion. Even though a bottle label states 12oz they are not usually that accurate.

A fluid ounce (abbreviated fl oz, fl. oz. or oz. fl.) is a unit of volume in both the imperial and the US customary systems. It is common to refer to the unit simply as an ounce, especially in cases where no confusion with the unit of mass (also called an ounce) is likely to occur.

Imperial fluid ounce The imperial fluid ounce is 1⁄160 of an imperial gallon making it very nearly the volume occupied by one avoirdupois ounce of water[1].

U.S. food labeling fluid ounce U.S. regulation 21 CFR 101.9(b)(5)(viii) also defines a fluid ounce as exactly 30 millilitres, but this is for use in nutrition labeling only.[5] This is not meant to concur with the customary US definition exactly but is a common source of confusion.[citation needed]

This is helpful, but I still don't know how to convert directly between grams and ml. Also what equation do I need to deel with the different densities of beers. Some beers will have a density of 1.008 and others will have a density of 1.020. This will change my results quite a bit. thank you for all of your help